In *La Clef des songes*, Tatténaï presents a French-language guide to interpreting dreams through an alphabetical arrangement of dream images, situations, and symbols. The work draws on a long tradition of dream manuals, offering readers a practical reference for exploring the meanings traditionally associated with what appears in dreams. Its entries are designed for quick consultation, making it useful both as a reference volume and as a tool for personal reflection on recurring dream themes. The book reflects popular approaches to oneiromancy and dream symbolism, positioning dreams as signs that may be read for insight, guidance, or prediction. It is best understood as a compact dream dictionary for readers interested in symbolic interpretation, folk traditions, and spiritual approaches to the dream world.